| Umbraculum umbraculum Lightfoot 1786 umbrella shell
At first glance the umbrella shell, Umbraculum umbraculum , could be mistaken for for an egg mass. The animal here is attached to an overgrown rock wall. It has a warty body and a small flat shell, which is too small for the animal to withdraw into. In this photo, the shell is overgrown with organisms similar to those on the wall. Umbraculum umbraculum has a light brown to bluish body and a single , plumed gill on the right side of the body.
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| Distribution | Northern Australia, widespread Indo-west Pacific | |
| Depth | to 20m | |
| Max size | shell length to 15 cms. | |
| Family | Umbraculidae | group = side-gilled sea slugs |
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